The flight demonstration and evaluation of the operation of the MIL-T-85289 Linear Optical Displacement Transducer (LODT) as an active sensing unit of the Advanced Flight Control Actuation System in a T-2C aircraft were successfully accomplished. The test installation contained a LODT as the rudder position feedback device, fiber optic link, computer interface unit, microcomputer, direct-drive rudder actuator, electronic drive unit, force transducers, and a localized 8000 PSI (55 MPa) hydraulic supply. The system met all laboratory and flight test objectives and demonstrated that the LODT represents a viable approach to EMI immunity in advanced aircraft control systems. (Author)


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